Question about updated? and new_entries method

[Steven Yue]

Hi, everyone

I'm using 0.2.0.rc2 recently. And got some questiones here

1) For the updated? method, why didn't it return a boolean, but return the time data instead, like "2012-07-02 14:47:08 -0400" ?

2) If you do updated_feed = Feedzirra::Feed.update(feed), it will update the 'feed' variable together with 'updated_feed', so I can do feed.new_entries, and got the same result as updated_feed.new_entries. I mean then, what's the difference between these two object then?